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authorNathan Huckleberry <nhuck@google.com>2022-05-20 21:14:53 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2022-06-10 11:40:16 +0300
commit17fee07a2ac577da18b44dd658a9c3c864281c49 (patch)
tree235a3d7c336a995f3f3be558aed5385c4d534de6 /crypto/Kconfig
parent7df7563b16aa0281cb811785e4bb3681b46e2a28 (diff)
downloadlinux-17fee07a2ac577da18b44dd658a9c3c864281c49.tar.xz
crypto: xctr - Add XCTR support
Add a generic implementation of XCTR mode as a template. XCTR is a blockcipher mode similar to CTR mode. XCTR uses XORs and little-endian addition rather than big-endian arithmetic which has two advantages: It is slightly faster on little-endian CPUs and it is less likely to be implemented incorrect since integer overflows are not possible on practical input sizes. XCTR is used as a component to implement HCTR2. More information on XCTR mode can be found in the HCTR2 paper: https://eprint.iacr.org/2021/1441.pdf Signed-off-by: Nathan Huckleberry <nhuck@google.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 19197469cfab..b9e4d511bf5a 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -460,6 +460,15 @@ config CRYPTO_PCBC
PCBC: Propagating Cipher Block Chaining mode
This block cipher algorithm is required for RxRPC.
+config CRYPTO_XCTR
+ tristate
+ select CRYPTO_SKCIPHER
+ select CRYPTO_MANAGER
+ help
+ XCTR: XOR Counter mode. This blockcipher mode is a variant of CTR mode
+ using XORs and little-endian addition rather than big-endian arithmetic.
+ XCTR mode is used to implement HCTR2.
+
config CRYPTO_XTS
tristate "XTS support"
select CRYPTO_SKCIPHER